Sodium persulfate

Sodium persulfate
Other names Sodium peroxodisulfate Sodium peroxodisulphate Sodium peroxydisulfate Sodium peroxydisulphate
Identifiers
CAS number	7775-27-1 Y
PubChem	62655
ChemSpider	56406 Y
EC number	231-892-1
UN number	1505
ChEMBL	CHEMBL502764 Y
RTECS number	SE0525000
Jmol-3D images	{{#if:[Na+].[Na+].O=S(=O)([O-])OOS([O-])(=O)=O|Image 1
SMILES [Na+].[Na+].O=S(=O)([O-])OOS([O-])(=O)=O
InChI InChI=1S/2Na.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2 Y Key: CHQMHPLRPQMAMX-UHFFFAOYSA-L Y InChI=1/2Na.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2 Key: CHQMHPLRPQMAMX-NUQVWONBAA
Properties
Molecular formula	Na2S2O8
Molar mass	238.10 g/mol (19.31& Na, 53.76% O, 26.93% S) [1]
Appearance	white powder
Density	2.40 g/cm3 Loose bulk density = 1.12 g/cm3[2] Crystal density = 2.59 g/cm3[3]
Melting point	180 °C decomp.
Solubility in water	55.6 g/100 ml (20 °C)
Hazards
MSDS	ICSC 1136
EU Index	Not listed
R-phrases	R8 R20 R22 R36 R37 R38
S-phrases	S17 S26 S36
NFPA 704	0 2 1 OX
Flash point	Non-flammable
Related compounds
Other anions	Sodium dithionite Sodium sulfite Sodium sulfate
Other cations	Potassium persulfate
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Sodium persulfate (Na₂S₂O₈) is a chemical compound. It is a strong oxidizer. It is a severe irritant of the skin, eyes, and respiratory system. It is almost non-hygroscopic and has particularly good ability to be stored for long time. It is easy and safe to handle. It is not combustible, but releases oxygen easily and assists combustion of other materials.

It is used as a bleach, both standalone (particularly in hair cosmetics) and as a detergent component. It is a replacement for ammonium persulfate in etching mixtures for zinc and printed circuit boards, and is used for pickling of copper and some other metals. It is a source of free radicals, making it useful as a radical initiator for emulsion polymerization reactions and for accelerated curing of low formaldehyde adhesives. It is also used as a soil conditioner and in manufacture of dyestuffs, modification of starch, bleach activator, desizing agent for oxidative desizing, etc.

Conditions/substances to avoid mixing persulfates with are: moisture, heat, flame, ignition sources, shock, friction, reducing agents, organic material, sodium peroxide, water, aluminium, and powdered metals.

Sodium persulfate is an oxidizing agent in chemistry, for example in a synthesis of diapocynin from apocynin where iron(II) sulfate is the radical initiator:^[4]

Sodium persulfate is synthesized using water and sodium sulfate (Na₂SO₄ * 10H₂O) in electrolysis with a pure platinum anode. ^[5] ( Link to IR Spectra ^[6] )

The standard redox potential of sodium persulfate into hydrogen sulfate is 2.1 V, which is higher than that of hydrogen peroxide (1.8 V) but lower than ozone (2.2 V).^[7] The sulfate radical formed in situ has a standard electrode potential of 2.7 V.

References